McPhail M J, Krane M H, Fontaine A A, Goss L, Crafton J
Applied Research Laboratory, Pennsylvania State University, State College, PA 16804, USA.
Innovative Scientific Solutions Inc., 2766 Indian Ripple Road, Dayton, OH 45440, USA.
Meas Sci Technol. 2015 Apr;26(4). doi: 10.1088/0957-0233/26/4/045301. Epub 2015 Feb 27.
This paper describes the extension of multicolor particle shadow velocimetry (CPSV) to the measurement of local acceleration in an Eulerian frame of reference. A validation experiment was conducted on a pendulous disk undergoing unsteady rigid body rotation. Angular velocity and acceleration profiles by CPSA are presented along with a comparison to recordings by an accelerometer mounted on the pendulum. CPSA is also demonstrated in a fully-developed turbulent pipe flow. Profiles of standard deviation of the local acceleration in the near wall region (0< <75) are compared to similar measurements by Christensen and Adrian. A favorable comparison is found between CPSA and particle image accelerometry (PIA). The effect of acceleration time delay, or the time between two velocity estimates, on local acceleration estimates is discussed.
本文描述了将多色粒子阴影测速技术（CPSV）扩展到在欧拉参考系中测量局部加速度。对一个作非定常刚体旋转的摆盘进行了验证实验。给出了通过CPSA得到的角速度和加速度分布，并与安装在摆上的加速度计的记录进行了比较。CPSA还在充分发展的湍流管流中得到了演示。将近壁区域（0< <75）局部加速度标准差的分布与克里斯滕森和阿德里安的类似测量结果进行了比较。发现CPSA与粒子图像加速度测量法（PIA）之间有良好的一致性。讨论了加速度时间延迟（即两个速度估计值之间的时间）对局部加速度估计值的影响。
